Dentifrice.



HERMAN C. G. LUYTIES, ST. LOUIS, MISSOURI.

' DENTIFRICE.

Specification of Letters Patent.

Application filed February 23, 1906. Serial No- 802.471.

Patented Oct. 30, 1906.

To all whom it may concern.-

Be it known that I, HERMAN C. G. LUY- TIES, acitizen of the United States, residing in the city of St. Louis, State of Missouri, have invented a new and useful Improvement in Dentifrices, of which the following is as ecification.

y invention relates to a dentifrice powder having healin soothin and antiseptic properties and is of that c ass wherein active oxygen is yielded by certain component parts of the powder when used. It has been proposed to use calcium peroxid in connectron with an abrading-powder for this purpose; but the oxygen of calcium peroxld is only liberated in an acid solution, and hence the mouth bein sometimes neutral or slightl alkaline the calcium peroxid frequently fai s to yield active oxygen.

have discovered that strontium peroxid,

either alone or incombination. with boracic acid, together with an abradingowder, possesses valuable properties, adapting it for use in connectionwith a dentifrice. Strontium peroxid yields active oxygen in neutral and sli htly alkaline solutions, as well as in acid so utions, and hence is more effective than calcium peroxid," which, asstated, needs acidity in orderyto yield active oxy en.

Strontium peroxid may be used alone in combination with an abrading-powder, such as precipitated chalk, or it may be comhined with other substances, as desired. As strontium possesses slightly caustic roperties it may be desirable to combine oracic acid therewith, the combination when in solution resulting in the formation of strontium borate, possessing the well-known healing, soothing, and antise tic properties of boracic acid and the slight y astringent properties of strontium, the caustic properties of strontium being neutralized by its combination with the boracic acid.

It is obvious that a sa onaceous substance may also be used in t e combination and that instead of being in the form of a owder it may becompressed into tablet or ozenge form.

As a raetical formula I have ascertained that a entifrice comprising when strontium peroxid andprecipitated chalk, for instance,-

are used from two to three per cent. of strontium peroxid is sufficient to yield active oxyen for the urpose described and that when oracic acid is used in the combination a similar percenta e of strontium peroxid and its equivalent in oracic acid produces a satisfactory dentifrice. If a saponaceous substance, vsuch as powdered castile soap, is added, I prefer to use from two to three per cent. thereoffor example, two per cent. of strontium peroxid, two per cent. of boracic acid, two per cent. of powdered castile soap, and ninety-four per cent. of precipitated chalk. It is obvious that coloring and flavoring matter may be added as desired and that the proportions stated may be altered and other ingredients added to or substituted for those mentioned.

What I claim, and desire to secure by Letters Patent, is

1. A dentifrice composition containing strontium peroxid and an abradingepowder.

2.. A dentifrice composition containing strontium peroxid, boracic acid and an abradmg-powder substantially in the proportions and for the pur 'se s ecified.

In witness w iereo I have hereunto si ned my name in the presence of two subscribing witnesses.

Witnesses:

Ron'r. W. AsnLaY, OLIN A. Fos'ran. 

